Monday
July 6, 2015

Posts by Jess


Total # Posts: 910

Calculus AP
Let R be the region in the first quadrant bounded by the graph y=3-√x the horizontal line y=1, and the y-axis as shown in the figure to the right. Please show all work. 1. Find the area of R 2. Write but do not evaluate, an integral expression that gives the volume of ...
March 1, 2013

Math
Oh I get it now, okay thank you very much!!
February 24, 2013

Math
Dalia made 8 party bags for her birthday party. Each bag contained 4 small gifts for her friends. When Denis said that she could come, Dalia had to make one more bag with 4 gifts. How many small gifts did Dalia need to fill her bags? Walter wrote this number model: 8 x (4+4)=...
February 24, 2013

maths
1) Suppose that an insect crawls in a plane in a path given in polar coordinates by r = be^kt; theta = kt; where b; k are positive constants and t is time.Find the velocity and acceleration vectors of the insect. Show that the angle between the velocity and acceleration ...
February 20, 2013

Math
How do you solve g? 4 = (1 + g)^20
February 15, 2013

Macroeconomics
Suppose GDP is $800 billion, taxes are $150 billion, private saving is $50 billion and public saving is $20 billion. Assuming this economy is closed, calculate consumption, government purchases, national saving and investment.
February 14, 2013

math
Suppose that you deposit $1735.50 in a savings account that pays 9.25% annual interest with interest credited to the account at the end of each year. Assuming no withdrawals are made, find the balance in the account after 4 years
February 12, 2013

Math
What are the steps to solve for n?: 50000 = 1000(1 + 0.8)^n
February 11, 2013

maths
1)is the ring of real polynomials R[X] countable and why ?
February 10, 2013

maths
Let a, b, c and d be vectors. (i) Show that (a - b) * (a + b) = a^2 - b^2
February 6, 2013

Physic
A block (mass 2.4 kg) is hanging from a massless cord that is wrapped around a pulley -3 2 (moment of inertia of the pulley = 1.3 x 10 kg·m ), as the drawing shows. Initially the pulley is prevented from rotating and the block is stationary. Then, the pulley is allowed ...
February 4, 2013

English
Thank you so much!
February 1, 2013

English
Rephrase the main idea of the sample in your own words, without repeating words or sentence structure from the original statement. (I honestly can't seem to decide on how it should be worded) "Air pollution can also have a significant impact on our economy. It can ...
February 1, 2013

English
I have: NPD have pointed out that smartphones have rapidly increased 84 percent from 2007 to 2008, and are currently selling fast in America.
February 1, 2013

English
Rephrase the main idea of the sample in your own words, without repeating words or sentence structure from the original statement. "Right now, smartphones are selling like mad in the U.S. market, where sales jumped 84 percent between 2007 and 2008, according to NPD, the ...
February 1, 2013

East
I need an equation that has something to do with the role of static friction in the design of tires
January 31, 2013

maths
n! is greater or equal to 2^n-1 prove by induction
January 11, 2013

math
A tree is struck by lightning. The top part breaks and falls to the ground. The part of the tree still standing is 30 feet tall and the top part that hit the ground is 40 feet from the base of the tree. How tall was the tree originally?
January 10, 2013

maths
integrate by parts integrate (4+x^2)^1/2
December 29, 2012

ap calculus
I'm sorry... I'm just not super comfortable posting my name on the web... Can you still please help me??
December 19, 2012

ap calculus
Which of the following definite integrals gives the length of y = e^(e^x) between x=0 and x=1? All the answers are preceded by the integral sign from 0 to 1. (a) sqrt[1 + e^(2*(x+e^x))] dx (b) sqrt[1 + e^(4x)] dx (c) sqrt[1 + e^(x+e^x)] dx (d) sqrt[1 + e^(2e^x)] dx (e) sqrt[e...
December 19, 2012

chemistry
Sorry but what do Ka/Kb values tell me?
December 15, 2012

chemistry
I know caffeine is more polar than salicylic acid but how would I explain that given their respective structures? I know for smaller molecules you would figure out the polarity of individual bonds and the molecule's geometry but I can't figure out how to transfer this...
December 15, 2012

Math
He's allowed to keep it is the fish is exactly 22 inches so you need to find the difference between 22 and the actual length of the fish (i.e. subtract how long the fish is from 22)
December 15, 2012

chemistry
Please help. My teacher never went over crystal lattices and the book doesn't cover it either :( Copper crystallizes in a face-centered cubic lattice. If the edge of the unit cell is 351pm, what is the radius of the copper atom?
December 10, 2012

Social Studies
In what ways did China And Europe parallel each other in their development until the sixth century CE? How did they diverge after that?
December 8, 2012

math
in order to increase the mean of 6 numbers by 3, what would the total sum of the increase be? A. 3 B.9 C.12 D.16 E.18
December 7, 2012

MATH urgent
Hello!! 1. find the third derivative of f(t)=(t-1)/(t+1) 2. y= x^(x^2) ; dy/dx please help! thank you!
December 6, 2012

HEALTH HELP PLEASE!!
Fats help maintain your cell membranes. (1 point) True False 12. Your body does not use energy when you sleep. (1 point) True False 13. People with anorexia nervosa eat large amounts of food and then purge. (1 point) True False 14. Your body image is the way others see your ...
December 5, 2012

maths
Let p(x) = 1 + 4x + 2x^2 + 2x^3 in Z5[x]. Find all roots of p(x), and write p(x) as a product of irreducible polynomials.
December 5, 2012

maths
differentaite w.r to x h(x) = arcosh(x^3 + 2).
November 25, 2012

pre cal
How lnog will it take for an investment of $1000 to double in value if it earns 5% coumpounded weekly?
November 24, 2012

Maths
in the following rings find all units, Zero divisors and idompotent elements and determine whether the ring is a field. a)Z2 b)Z5 c)Z10 NB z is integers( positive or negatives including zero z is integers( positive or negatives including zero
November 20, 2012

physics
An object moves along a circular path with a constant speed, |⃗vo|. (Semi Circle with point A on one side point B on the other. Looks like a 90 degree angle with points A and B on either side of the hypotenuse.) The average acceleration in going from A to B is 1. zero 2...
November 8, 2012

Maths
steve
November 8, 2012

Maths
(cos8x+cos2x)/2 steve is it right
November 8, 2012

Maths
cos3xcos5x how do rewrie this using trigmetric finctions Steve thanks
November 8, 2012

Maths
Steve help please
November 8, 2012

Maths
how did you do sin2x cos4x = (sin6x + sin2x)/2 what os the formula I need to use
November 8, 2012

Maths
1)how do you simplify 3xcos5x using trigometric functions 2)how do you simplify sin2xcos4x using trigometric functions
November 8, 2012

maths
thanks steve SO DOES ANSWER CHANGE IF ABELIAN?
November 6, 2012

maths
let G be a group with operation . and let p,q be two elements of G. simplify p.q.q.q^-1.p^-1.q^-1 as much as possible.does answer change if G is ABELIAN?
November 6, 2012

MATHS
prove by mathematical induction that 7^n+4^n+1 is divisible by 6
October 31, 2012

Geometry
my geometry problem set says "find the ratio of CG : CB" CG=6.3 and CB=19 so to find the ratio i would divide the 19 by 6.3 (we have to round so it would be a 3:1 ratio) or would it be the other way around? i think it's the 19/6.3 but i'm not sure...
October 25, 2012

math
I am a 3 digits number less than 200. the tenths place is 2x more than the ones place. the number in the ones place is 2. what number am i?
October 24, 2012

orgoo
calculate how to make 10 mL of 15:85 ethyl acetate:hexane solution from 2 mL of 5:95 ethyl acetate:hexane, using pure hexane and pure ethyl acetate.
October 13, 2012

writing
I have to write an essay about how Morrison uses power stuggle in Beloved to enhance the meaning of her work. I think I have some idea, but I'm just sitting here numberless. This essay is due in about 2 days. Can you help me ASAP? Thanks
October 12, 2012

Physics
1. mg/(cos(sin^-1(r/L)))
October 10, 2012

world civilization
what was the relationship between politics and science in the early modern world?
October 4, 2012

Chemistry
A particular oral contraceptive contains 0.041 mg of ethinyl estradiol in each pill. The formula of this compound is C20H24O2. How many moles of ethinyl estradiol are there in one pill? I need help in approaching this
October 3, 2012

math
Is 4,564,282 a prime or composite number?! Seriously, I have absolutely no idea!!!!!!
September 26, 2012

Chemistry H.
5.07301149
September 23, 2012

orgoo
what are the products of the reaction: HC3OH + (Na+NH2-) ?
September 14, 2012

orgo
What is the pH of a 5.00E-2 M solution of acetylsalicylic acid, pKa = 3.52.
September 14, 2012

chem
calculate the pH of 5x10^-2 M of benzoic acid with pKa= 4.19
September 14, 2012

math
what is the rule for the following: x = 1,2,3 y = 2,6,12
September 12, 2012

Physics
A bug completes one lap along the edge of a circular planter of radius 22.4 cm in 16.45 s. How fast was it traveling? Answer in units of cm/s.
September 9, 2012

aglebra 2
determine whether the equation has one solution, no solution, or is an identity. 5y+3=26
September 6, 2012

chem
P1V1/T1=P2V2/T2 ; basic proportion. STP mean standard temperature and pressure P1=700 torr V1=8 Liters T1=293K P2=standard pressure=1 atm=760 torr V2=unknown T2=standard temperature=273K i hope you can follow my though process. (700*8)/293=(760*V)/273 V=6.87
August 13, 2012

Dressmaking and design
a straight facing can be used to finish?
July 24, 2012

Bio HELP!!!!
what is the name of the process throughh which polypeptides, polysaccharides or triglycerides are catabolised (broken down)?
July 7, 2012

math
Use the midpoint formula
July 7, 2012

chemistry
.5566
June 21, 2012

math equations
Solve x = log3 15
June 12, 2012

Chemistry
how much chlorine, Cl 2, do you need to order to react completely with 500 kg of platinum, Pt, to make cisplatin, PtCl 2(NH 3) 2?
June 5, 2012

Algebra 2
five chips numbered 1 through 5 are placed in a bag. A chip is drawn and replaced. Then a second chip is drawn. Find the probability that the first chip is even and the other one is odd.
May 30, 2012

Chemistry
Exothermic means you release energy. D, freezing water, means the water releases heat in order to freeze. This release of heat, aka energy, makes it exothermic. The other answer choices require energy, making them endothermic.
May 22, 2012

World History
China had the largest economy still, thankfully I got it right. Thanks though!
May 22, 2012

World History
At the end of the eighteenth century, _______ had the largest economy in the world. A. India B. Spain C. China D. Britain I've researched this question like crazy, but I just can't seem to determine a clear answer. I know it's between China and Britain. Britain had...
May 22, 2012

biology
Need help with FOV area (mm2) totally confused? im confused i have the FOV diameter they are: 4x = 5 10x = 2 40x = 0.5 a classmate told me she thinks the area for 40 x is: pi(5/2)^2 = 19.6 not sure if thats true or how to do it for the low and medium, magnification. please ...
May 22, 2012

math
If there are 50 floats in a parade, how many ways can a first place and a second place trophy be awarded?
May 7, 2012

Math
uh i think its 1/1024
May 2, 2012

math
the hypotenuse of a right triangle is 3 less than 4 times the shortest leg. if the longest leg is 24cm, how long is the hypotenuse
April 30, 2012

algebra 2
write an explicit formula for the sequence of 1/2, 3/7, 1/3, 5/19, 3/14
April 30, 2012

chemistry
An air sample contains 0.032%CO2 .If the total pressure is 756mmHg , what is the partial pressure ofCO2 ?
April 28, 2012

chemistry
A sample of gas has a mass of 0.555g . Its volume is 114L at a temperature of 80degrees C and a pressure of 744mmHg .Find the molar mass of the gas
April 28, 2012

chemistry
An experiment shows that a 111ml gas sample has a mass of 0.161g at a pressure of 725mmHG and a temperature of 36degrees C.What is the molar mass of the gas?
April 28, 2012

chemistry
How many moles of gas must be forced into a 3.1L ball to give it a gauge pressure of 9.8psi at 22degrees C? The gauge pressure is relative to atmospheric pressure. Assume that atmospheric pressure is 14.5psi so that the total pressure in the ball is 24.3psi .
April 28, 2012

algebra 2
Carlos wants to make a scale drawing of a rectangle. he wants the rectangle to have a length of (x-1) units and an area of 1-x/x^2+1 square units. What can you say about how wide the rectangle should be? Explain.
April 26, 2012

chemistry
Calculate the pressure drop expected on hydrogenation of the mixture of 5.00 ml of cyclohexene and 35 ml of cylclohexane. I know I have to use PV=nRT but this is all I know we are starting at 60 psi of pressure. We also used hydrogen gas if that helps
April 25, 2012

chem
calculate the concentration of borate ion for a titration when 6.0998g borax is dissolved in 100mL of water and titrated with 25.5mL of HCl
April 24, 2012

Chemistry
What is the pH of a 2.5 x 10-2 M HCl solution? I'm so confused how to find this :(
April 24, 2012

chem
A hydrofluoric acid buffer solution has the following concentrations: [HF]=0.43M [F-]=0.45M If 40 mL of 0.1M NaOH is added to 500 mL of the buffer, what is the resultant pH?
April 19, 2012

Physical Science
The conversion of water to ice is considered a physical change, whereas the conversion of iron to rust is considered a chemical change. Why?
April 19, 2012

calculus
what is the linear approximation of f(x)=x^3-x at x=2
April 19, 2012

chem
what is the ph of a solution that results from adding 30 mL of .015M KOH to 50 mL of .015 M benzoic acid?
April 17, 2012

Geology
Granite age for Scottish highlands
April 16, 2012

English
how has the world changed for the better? besides technology & medicine
April 15, 2012

trig
if one of a quadratic equation is 1/2-2i, what is the equation. the other root is 1/2+2I but i dont know how to find the equation
April 5, 2012

American Government
Who has to run for re-elecition every two years?
March 27, 2012

Social studies
Why would the Chinese want to limit population growth?
March 25, 2012

chemistry
Given that [O3]=4.0× 10–4 M and [NO]=3.0× 10–5 M at t=0, calculate the rate of the reaction at t=0.
March 23, 2012

math
1) Why should we clear fractions when solving linear equations and inequalities? Demonstrate how this is done with an example. Why should we clear decimals when solving linear equations and inequalities? Demonstrate how this is done with an example.
March 21, 2012

History
Little Richard, Chuck Berry, Fats Domino, Frankie Lymon and... Martin Luther King?
March 18, 2012

algebra
X*(x+10)=880ft X square=870 ft u find the square root of 870 and plug it in to the first equation
March 17, 2012

chemistry
Calculate the number of grams of h2c2o4.2h2o needed to prepare exactly 250mL of a 0.200 N solution of the acid?
March 16, 2012

algebra
Make a function table for each function. The cost of 1 to 5 books at $2. 95 each.
March 13, 2012

Math - HELP !
turn 62% into a fraction which is then .62 then mulitply 50 by.62 and you get 31 and that is your answer
March 10, 2012

physics
Tarzan plans to cross a gorge by swinging in an arc from a hanging vine. If his arms are capable of exerting a force of 1820 N on the rope, what is the maximum speed (in meters/second) he can tolerate at the lowest point of his swing? His mass is 83.0 kg, and the vine is 11.0 ...
March 10, 2012

English-Poetry
What does riprap symbolize in Gary Snyder’s poem, “Riprap”? A.the barriers of friendship B.the needless walls we build around ourselves C.the journey and the workmanship of the trail of life D.the things we bother ourselves with in life I think the answer is C...
March 9, 2012

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